<!DOCTYPE html>
<html>
	<head>
		<meta charset="UTF-8">
		<title></title>
		<style type="text/css">
			.one{
				width: 100px;
				height: 100px;
				background: red;
				float: left;
			}
			
			.two{
				width: 100px;
				height: 100px;
				background: yellow;
				float: right;
			}
			
			.three{
				width: 100px;
				height: 100px;
				background: blue;
			}
			
			#cl{
				clear: both;
			}
		</style>
	</head>
	<body>
		<div class="father">
			<div class="one"></div>
			<div class="two"></div>		
			<div id="cl">
			
			</div>
			<div class="three"></div>
		</div>
		
		
		
			
		
	</body>
</html>
